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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
Muscles that move the Arm Deltoid-large muscle over the point of the shoulderOriginates on the scapula and the clavicleInserts on the humerus at the deltoid tuberosityACTIONS: abducts, flexes and rotates the arm Deltoid.